Jonathan Taylor among the few NFL players to wear the 'guardian cap' on his helmet

The NFL has been using the guardian cap during training camp practices for a while. You've likely seen them in photos.

It's a huge pad that goes over the regular football helmet, and it is designed to prevent concussions. This season for the first time, the NFL allowed players the option to wear the guardian caps during games.

Not many players took the league up on the offer but one star did: Indianapolis Colts running back Jonathan Taylor.

Taylor was wearing the cap during Sunday's preseason game against the Denver Broncos. It does look odd when the camera zooms in, with a cover featuring the Colts logo stretched over it.